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토양수분조절과 저단밀식재배가 토마토의 생육 및 수량에 미치는 영향
김기돈,윤화모,Kim, Gi-Don,Yoon, Wha-Mo 배재대학교 자연과학연구소 2004 自然科學論文集 Vol.14 No.2
본 연구는 토양수분조절과 저단밀식재배가 토마토의 생육, 수량 및 품질에 미치는 영향을 조사하고자 화방을 2단 및 3단으로 제한하는 동시에 재식밀도를 높게 하여 단위면적당 화방수를 증가시켜 토양수분 억제에 의한 수량 감소를 최소화하고자 수행하였다. 토양수분조절은 개화 40일 후에 관수개시점을 각각 -50kPa, -30kPa, -10kPa로 설정하였으며, 재식주수는 저단밀식재배를 목적으로 대조구에 비하여 2배를 정식하였다. 토양수분억제로 경경, 엽, 초장의 생장이 저하되었으며, 엽의 엽록소함량은 저단밀식재배의 -50kPa과 -30kPa처리에서 대조구에 비하여 높아지는 경향을 보였지만, 저단밀식재배의 -10kPa처리에서는 6단재배한 대조구의 엽록소함량에는 차이가 없었다. 과실의 배꼽썩음과와 열과는 토양수분이 억제될수록 발생율이 높았고 2단재배보다는 3단재배에서 발생율이 높았다. 토양수분의 억제는 과중의 감소를 초래하였고, 특히 저단밀식재배의 -50kPa처리에서 뚜렷한 감소를 보였다. 착과수는 토양수분조절에 따른 차이가 없었지만 제 1화방보다는 제 2화방과 3화방으로 올라갈수록 착과수가 감소하였다. 과실의 건물률은 토양수분이 억제된 -50kPa과 -30kPa처리구에서 대조구보다 높아지는 경향을 보였고, 2단재배보다는 3단재배에서 높아지는 경향을 보였다. 상품수량은 토양수분이 억제된 2단재배의 -50kPa과 -30kPa처리구에서 대조구에 비해 각각 46.3%, 36.7%가 감소하였고, 3단재배는 대조구에 비하여 각각 32.3%, 27.3% 감소하였다. This study aims at investigating the effect of soil moisture control and truss limited high density culture on the growth, fruit yield and quality of tomato. To minimize of loss yield of tomato, flower cluster in number was limited to two and three truss and planting density was raised. Soil moisture control was started from 40 days after anthesis and irrigation point was set in -30kPa and -50kPa, which were compared with -10kPa For high density culture, the planting number of truss limited high density culture was planted twice as many as control. Soil moisture repression reduced the growth of stem diameter, leaf and plant height. Leaf chlorophyll content was higher in -50kPa and -30kPa than control. No significant differences, however, shows in -10kPa. The occurrence rate of bloom-end rot and cracking was increased by growing of irrigation repression. Pinching three fruit truss was higher than pinching two fruit truss in the occurrence rate of them. Soil moisture repression resulted in the reduction of fruit weight and in special, truss limited high density was distinctly decreased in -50kPa. The number of fruit was not affected by soil moisture control, but 3rd flower cluster was lower than 2nd flower cluster in the number of fruits and 2nd one was lower than 1st one. Under irrigation repression, rate of dry matter tended to grow in -30kPa, -50kPa compared with control and pinching three fruit truss was higher than two truss. Marketable yield dropped to 36.7%m 46.3 in -30kPa, -50kPa on pinching two fruit truss and dropped to 27.3%, 32.3% in 3rd flower cluster compared with control.
밀리미터파 대역 NRD Stepped-Impedance 듀플렉서
김기돈,이재곤,이정해 한국전자파학회 2003 한국전자파학회논문지 Vol.14 No.12
본 논문에서는 밀리미터파 대역에서 NRD guide를 이용한 듀플렉서를 설계하였다. 설계된 듀플렉서는 두개의 stepped-impedance 필터와 한 개의 T-Junction으로 구성되어 있다. 차단영역 도파관 등가회로를 이용하여 stepped-impedance 필터를 설계하였고, T-Junction은 반사손실을 -20 dB 이하로 최적화하였다. 듀플렉서를 제작하여 측정한 결과 응답특성이 시뮬레이션 결과와 일치함을 확인하였다. In this paper, we have designed the duplexer using non-radiative dielectric(NRD) guide in millimeter wave band. The designed duplexer is composed of two stepped-impedance filters and T-junction. Stepped-impedance filters we designed with an equivalent circuit model of evanescent waveguide and the T-junction is optimized to minimize return loss of -20 dB or more. The characteristics of duplexer show good agreements with the expected results.
Synthesis of Cu<sub>2</sub>ZnSnS<sub>4</sub> Nanocrystals by using method of hot injection
김기돈,인수일 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Cu<sub>2</sub>ZnSnS<sub>4</sub> (CZTS) was studied as a material which can absorb visible light. CZTS is a p-type semiconductor with a band gap energy of 1.5 eV, which is suitable for solar energy conversion. This material consists of low toxic and abundant elements. It also is functions efficiently in the polycrystalline state. Recently in order to solve the CO<sub>2</sub> emission, CZTS was successfully achieved by using thin film of CZTS with a metalcomplex electrocatalyst. In this work, an attempt was done to synthesize CZTS by using hot injection, because the method is inexpensive. The synthesized CZTS was confirmed by numerous characterization techniques such as XRD, TEM, and UV Vis spectroscopy. The material also was measured for confirming production of methane using gas chromatography.
김기돈,유승기 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.2
Recently, in the line with the growing interest of sanitary problem, the requirement for the development of anti-bacterial material has been an issue with more weight. In Japan, not only some steel makers already completed the development of the anti-bacterial stainless steel, but other makers are also showing an interest in that subject. The function anti-bacterial power of stainless steel is closely related with the addition of Cu element. In this case, Cu decomposes as Cu^(2+) and reacts with COA-SH enzyme which acts as a catalyst in respiratory process of bacteria, resulting in deactivation of the enzyme. The current study derived an optimum anti-bacterial alloy composition, proper process conditions including heat treatment and the overall comparison with the previous developed POSCO-304J1 stainless steel. With the proper heat treatment the anti-bacterial power of the developed alloy is increased due to the uniform distribution of ε-Cu precipitates (0.5∼1.0 ㎛) restraining the formation of passive film on the steel surface.